Theorem srglz 18350

Description: The zero of a semiring is a left-absorbing element. (Contributed by AV, 23-Aug-2019.)

Hypotheses

Ref	Expression
srgz.b	⊢ 𝐵 = (Base‘𝑅)
srgz.t	⊢ · = (.r‘𝑅)
srgz.z	⊢ 0 = (0g‘𝑅)

Assertion

Ref	Expression
srglz	⊢ ((𝑅 ∈ SRing ∧ 𝑋 ∈ 𝐵) → ( 0 · 𝑋) = 0 )

Proof of Theorem srglz

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		srgz.b	. . . . . . . 8 ⊢ 𝐵 = (Base‘𝑅)
2		eqid 2610	. . . . . . . 8 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
3		eqid 2610	. . . . . . . 8 ⊢ (+g‘𝑅) = (+g‘𝑅)
4		srgz.t	. . . . . . . 8 ⊢ · = (.r‘𝑅)
5		srgz.z	. . . . . . . 8 ⊢ 0 = (0g‘𝑅)
6	1, 2, 3, 4, 5	issrg 18330	. . . . . . 7 ⊢ (𝑅 ∈ SRing ↔ (𝑅 ∈ CMnd ∧ (mulGrp‘𝑅) ∈ Mnd ∧ ∀𝑥 ∈ 𝐵 (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 ))))
7	6	simp3bi 1071	. . . . . 6 ⊢ (𝑅 ∈ SRing → ∀𝑥 ∈ 𝐵 (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 )))
8	7	r19.21bi 2916	. . . . 5 ⊢ ((𝑅 ∈ SRing ∧ 𝑥 ∈ 𝐵) → (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 )))
9	8	simprd 478	. . . 4 ⊢ ((𝑅 ∈ SRing ∧ 𝑥 ∈ 𝐵) → (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 ))
10	9	simpld 474	. . 3 ⊢ ((𝑅 ∈ SRing ∧ 𝑥 ∈ 𝐵) → ( 0 · 𝑥) = 0 )
11	10	ralrimiva 2949	. 2 ⊢ (𝑅 ∈ SRing → ∀𝑥 ∈ 𝐵 ( 0 · 𝑥) = 0 )
12		oveq2 6557	. . . 4 ⊢ (𝑥 = 𝑋 → ( 0 · 𝑥) = ( 0 · 𝑋))
13	12	eqeq1d 2612	. . 3 ⊢ (𝑥 = 𝑋 → (( 0 · 𝑥) = 0 ↔ ( 0 · 𝑋) = 0 ))
14	13	rspcv 3278	. 2 ⊢ (𝑋 ∈ 𝐵 → (∀𝑥 ∈ 𝐵 ( 0 · 𝑥) = 0 → ( 0 · 𝑋) = 0 ))
15	11, 14	mpan9 485	1 ⊢ ((𝑅 ∈ SRing ∧ 𝑋 ∈ 𝐵) → ( 0 · 𝑋) = 0 )

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∀wral 2896  ‘cfv 5804  (class class class)co 6549  Basecbs 15695  +_gcplusg 15768  ._rcmulr 15769  0_gc0g 15923  Mndcmnd 17117  CMndccmn 18016  mulGrpcmgp 18312  SRingcsrg 18328

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-nul 4717

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-iota 5768  df-fv 5812  df-ov 6552  df-srg 18329

This theorem is referenced by:  srgmulgass  18354  srgrmhm  18359